偏心潜孔锤套管跟进钻孔旋喷桩基坑止水施工技术

Research on Construction Technology of Follow-up Eccentric Sleeve DTH Drilling Chemical Churning Piles in Foundation Ditch Water-Seal

结合实际工程,详细介绍了在临海复杂地质条件下,采用偏心潜孔锤套管跟进钻孔旋喷桩基坑止水施工新技术.本工程所处位置为填海造陆区,场地水文地质、工程情况十分复杂,帷幕施工难成孔,孔壁坍塌和漏浆严重,并且受到潮汐的影响,采用偏心潜孔锤套管跟进钻孔+PVC管护壁旋喷桩施工及双排桩施工工艺,有效地达到了基坑止水效果并保证了工期.

In light with the practical project,this paper focused on introducing the new technology of follow-up eccentric sleeve DTH drilling chemical churning piles in foundation ditch water-seal.The project was located in a land reclamation area with complex site hydrogeology and engineering and it was difficult to dill holes.The walls of the holes were likely to collapse,the severe plasma leakage to occur and the construction was affected by the tides.After studying the actual engineering conditions,the construction technology of follow-up eccentric sleeve DTH drilling ＋PVC pipe wall construction and two-bank piles was used,which achieved the desired water-seal effect and guaranteed the construction period.